Search results for "ODS"
showing 10 items of 5812 documents
The Role of Vitamin Deficiency in Liver Disease: To Supplement or Not Supplement?
2021
Over the past few years, growing interest has been shown for the impact of dietary requirements and nutritional factors on chronic diseases. As a result, nutritional programs have been reinforced by public health policies. The precise role of micronutrients in chronic liver disease is currently receiving particular attention since abnormalities in vitamin levels are often detected. At present, treatment programs are focused on correcting vitamin deficiencies, which are frequently correlated to higher rates of comorbidities with poor outcomes. The literature reviewed here indicates that liver diseases are often related to vitamin disorders, due to both liver impairment and abnormal intake. M…
Purification and structural characterisation of lipid transfer protein from red wine and grapes
2012
Lipid transfer proteins (LTP) play a major role in plant defence and are of particular interest due to their known ability to cause allergic reactions. These proteins are expressed in grapes and also remain detectable after vinification, especially in red wine. However, it remains unknown whether the protein undergoes any changes during the vinification process. Here, we present a purification method for LTPs from Dornfelder grapes and wine. By liquid-chromatography-mass spectroscopy (LC-MS/MS) we identified LTPs from two different species (Vitis vinifera and Vitis aestivalis). Additionally, the purified LTPs were characterised using spectrometric methods, confirming their high purity and s…
Effects of Two Instructional Procedures on Spanish University Students’ Comprehension Monitoring when Reading Science Texts in English
2015
Abstract Two instructional approaches on comprehension monitoring in English as FL are contrasted. Although using the same materials (elementary science texts), one of them is based on tasks focusing on vocabulary and grammar, and the other one is based on main ideas identification and textual coherence. The English proficiency level was controlled and comprehension monitoring measures were obtained in the pretest and the posttest using embedded micro and macro-structural inconsistencies in texts. Results showed that teaching students to read in order to understand main ideas and to elaborate the text macrostructure produce better results than focusing attention on discourse low-level compo…
Test fairness: a DIF analysis of an L2 vocabulary test
2000
The purpose of this study is to analyse gender-uniform differential item functioning (DIF) in a second language (L2) vocabulary test with the tools of item response theory (the separate calibration t-method) and to study potential gender impact on the test performance measured by different item composites. The results of the study show that despite the fact that there are test items with indications of DIF in favour of either females or males, the test as a whole is not gender-biased. In spite of this, it was demonstrated that some item composites are gender-biased. In view of item bank building and use, it means that some of the tests constructed on the basis of an item bank might be bias…
Modulation of voltage-gated Na+ and K+ channels by pumiliotoxin 251D: A “joint venture” alkaloid from arthropods and amphibians
2008
Abstract Certain amphibians provide themselves with a chemical defense by accumulating lipophilic alkaloids into skin glands from dietary arthropods. Examples of such alkaloids are pumiliotoxins (PTXs). In general, PTXs are known as positive modulators of voltage-gated sodium channels (VGSCs). Unlike other PTXs, PTX 251D does not share this characteristic. However, mice and insect studies showed that PTX 251D is highly toxic and to date the basis of its toxicity remains unknown. In this work, we searched for the possible target of PTX 251D . The toxin was therefore made synthetically and tested on four VGSCs (mammalian rNa v 1.2/β 1 , rNa v 1.4/β 1 , hNa v 1.5/β 1 and insect Para/tipE ) and…
Técnicas de análisis de posproceso en resonancia magnetica parael estudio de la conectividad cerebral
2011
Brain connectivity is a key concept for understanding brain function. Current methods to detect and quantify different types of connectivity with neuroimaging techniques are fundamental for understanding the pathophysiology of many neurologic and psychiatric disorders. This article aims to present a critical review of the magnetic resonance imaging techniques used to measure brain connectivity within the context of the Human Connectome Project. We review techniques used to measure: a) structural connectivity b) functional connectivity (main component analysis, independent component analysis, seed voxel, meta-analysis), and c) effective connectivity (psychophysiological interactions, causal …
Stratēģiskas tiesvedības un žurnālistu aizsardzība pret tām Latvijā
2020
Stratēģiskas tiesvedības pret žurnālistiem ir veids, kā personas var izmantot savas tiesības uz jautājuma izskatīšanu tiesā ļaunprātīgā nolūkā – lai iesaistītu atbildētāju ilgstošā tiesu procesā, tādā veidā patērējot atbildētāja laika un finanšu resursus, kā arī iebiedētu žurnālistus un radītu atvēsinošu efektu citos žurnālistus. Autora mērķis šajā darbā ir noskaidrot, vai Latvijā žurnālisti ir pietiekami aizsargāti pret stratēģiskām tiesvedībām un vai ar stratēģiskām tiesvedībām ir iespējams ierobežot mediju brīvību Latvijā, kā arī rast risinājumus mediju brīvības stiprināšanai. Šajā darbā autors secina, ka kopumā mediju brīvība Latvijā nav apdraudēta, taču atsevišķos tiesvedību gadījumos …
Botānikas katedras mācību preparāti
2020
Latvijas Universitātes Muzeja Botānikas un mikoloģijas kolekcijās glabājas vēl Rīgas Politehniskā institūta (1896—1918) mācību preparāti, kas vēlākos gados ir izmantoti LU Botānikas katedrā. Raksts iepazīstina ar mikrosēņu mācību preparātiem un mikologa Jūlija Smaroda (1884 – 1956) “Latvijas sēņu eksikāts” (Fungi latvici exiccati) kolekcijām.
Effective field theory search for high-energy nuclear recoils using the XENON100 dark matter detector
2017
International audience; We report on weakly interacting massive particles (WIMPs) search results in the XENON100 detector using a nonrelativistic effective field theory approach. The data from science run II (34 kg×224.6 live days) were reanalyzed, with an increased recoil energy interval compared to previous analyses, ranging from (6.6–240) keVnr. The data are found to be compatible with the background-only hypothesis. We present 90% confidence level exclusion limits on the coupling constants of WIMP-nucleon effective operators using a binned profile likelihood method. We also consider the case of inelastic WIMP scattering, where incident WIMPs may up-scatter to a higher mass state, and …
Agent assisted interactive algorithm for computationally demanding multiobjective optimization problems
2015
Abstract We generalize the applicability of interactive methods for solving computationally demanding, that is, time-consuming, multiobjective optimization problems. For this purpose we propose a new agent assisted interactive algorithm. It employs a computationally inexpensive surrogate problem and four different agents that intelligently update the surrogate based on the preferences specified by a decision maker. In this way, we decrease the waiting times imposed on the decision maker during the interactive solution process and at the same time decrease the amount of preference information expected from the decision maker. The agent assisted algorithm is not specific to any interactive me…